KARAKTERISTIK BALOK BETON DENGAN CAMPURAN MORTAR PADA INTI CORE ZONE

Currently, structure of composite beams of concrete mortar and normal concrete are needed in construction area.This is because lightweight concrete of mortar- can enhances elasticity and decrease the loads of structure whethergravitational loads or earthquake loads. One way to gain the lightweight structures is by using timber particle waste(density 0,35-0,65 gr/cm3) into the mixture of mortar the core zone. Series of experimental tests were done with variansmodels with thickness and shear connectors. The data are form measurement of basic units interpreting concretemechanical with concrete mortar as the element of composite beams. The samples of composite concrete beams andnormal concrete beams are 15x20x120cm and shear connectors and are varied according to the shapes. The resultsshowed that modeling of normal beams and mortar beams as core zones showed significant differences. By obtaining theflexural strength of a normal concrete beam of 5.371 Mpa, the flexural stress is 7.024 MPa, the shear stress is 1.487 MPaand concrete mortar with flexural strength of 5.240 MPa, flexural stress 7.134 MPa and displaced shear 1.459 MPa ...Exterior zone thickness 5 cm has a flexural strength effective. .This indicates that the level of brittleness greatly affectsthe flexural strength of the test beam. The higher the level of elasticity of the concrete material, it will make the beamrelatively weak against bending